Double-belt sander.



PATENTED APR. 24, 1906.

DE LASKI T. GLEMONS.

DOUBLE BELT SANDER.

APPLICATION FILED NOV. 16, 1904.

4 SHEETS-SHEET 1.

PATENTED APR. 24, 1906.

' \DE LASKI TV. OLEMONS.

DOUBLE BELT SANDER.

APPLICATION FILED NOV. 16, 1904.

4 SHEETS-SHEET 2.

No. 818,518. I PATENTED APR. 24, 1906.

DE LASKI T. GLEMONS. 7 DOUBLE BELT SANDER.

APPLICATION FILED NOV. 16. 1904.

4 SHEETS-SHEET 3.

PATENTED APR. 24, 1906.

DE LASKI T. OLEMONS. DOUBLE BELT SANDER. APPLICATION FILED NOV. 16. 1904.

4 SHEETS-SHEET 4.

UNITED STATES PATENT oFEioE.

DE LASKI T. OLEMONS, or HORNELLSVILLE, NEW YORK.

DOUBLE-BELT SANDER.

' Patented Apr-i124, 1906.

i all whom it may concern:

movement over the work to the table, belts, and pressure mec Be it known that I, DE LASKI T. CLEMoNs,

a citizen of the United States, residing at Hornellsville, in the county of Steuben and State of New York, have invented certain new and useful Im rovements in Double- Belt Sanders of which the following is aspecification, reference being had therein to the accompanying drawings.

The present invention relates to belt-sanding machines of that ,type in which an endless sand-belt is given a ra id' continuous ress and finish the same, suitable beltuide and pressure appliances being provided to bring the belt into contact with the work.

The machine which I have invented comprises as one of its essential featuresimproved means and devices for bringing the sand belt or belts into contact with the wbrk, so as to maintain either .a uniform pressure of the sand-belt upon the work to be finished or to vary the pressure alon the belt at the will of the operator in order t at any low places in the work may be efiectively reached by the belt and roperly finished, the said pressure devices eing operated b fluid-pressure to the end that effective an uniform pressure of the belt upon the work may be se cured and that a satisfactory variation in pressure along the belt maybe quickly and conveniently efiected.

Another feature of the machine hereinafter described is the means for supporting and adjusting the work-support relatlve to the sand- 1 belts and preserving the relative ositions of fianisms.

Other features of novelconstruction will be hereinafter pointed out, and those features which I deem as peculiarly of my invention will be defined in the claims appended here-' unto.

While I shall describe hereinafter and have illustrated in the drawings herewith, a douthereof. Fig. 2 is a view in side elevation of the machine, parts of the supportin -frame being broken away or in'section to il ustrate the supports and adjusting mechanism for both the work-table and the pressure devices. Fig. 3 is a detail lan view approximately upon the line 3 3 of i 2 lookin 1n the direction of the arrows to i ustrate t e work-table supports and the adjusting devices therefor. Fig. 4 is an enlar ed detail view of a "portion of the work-ta le-supporting tracks, the work-table, the .pressure mechanism, and their several adjusting devices. Fi 5 is an enlarged sectional view transverse y of the belt-guides and the pressure devices to illustrate the fluid-pressure connections for said ressure devices. Fig. 6is a detail view to lllustrate the manner of supporting the beltguide. Fig. 7 is a detail bottom v1ew of the three-way cock for controlling the fluid-pressure and the pressure connections therewith. Fig. Sis a detail sectional view of the operating mechanism for raising and lowering the pressure mechanism to secure an adjustment of the same relative to the work and worktable.

Referring to the drawings by numerals, like numbers indicating like arts in the several views, 2 indicates the ase of the ma chine, which may be of any suitable or de-.

sired construction and which has at each end a hollow post or pedestal 3, which form the supports for the work-table, ressure mechamsm, sand-belt pulleys, and drivingshafts and pulleys of the machine, said posts being slotted or open on their inner sides to permit of the vertical movement and adjustment of some of the parts which are housed within them, as will hereinafter ap ear. Mounted in suitablebearings at one en of the machine is the main driving-shaft' i', which is provided at one end with the usual fast and loose drivingpulleys, which receive power from any suitshafts 9, fixed or formed integral with trans- -versely-placed plates 10, which in turn are pivotally mounted upon longitudinally-slidlng plates .11, mounted in a dovetailed bedplate 12, extending outwardly from the end of the machine-frame. Each of these sliding plates 1 1 is provided with an adjusting-screw 13', so that the said slidin plates 11, the plates 10, and the sand-belt pul e s 7 and 8 carried thereby may be indepen ently adjusted to secure the proper tensionon the sand-belts. The said pivoted plates 10 may be angularly adjusted, by means of inde endent screws 14, in order that the belt-pul eys may be truecY or alined lock-scfiews passing through areshaped slots 151 in said plates 10 to lock the plates in their adjusted positions.

Extending longitudinally of the machine at the rear thereof is a supporting-beam 16,

on which beam in suitable bearing-1n s 161 is mounted a rocking shaft 17, said sha t having fixed thereto supporting-arms 18, from the forward end of which arms 18 the pressure mechanism is hung. As above stated, this pressure mechanism, which forms an important part of my invention, will be described and illustrated in connection with a double-belt sander, although it will be distinctly understood that this feature of my invention, as well as the other novel features, are equally applicable to a single-belt sander.

Hung from the ends of the supporting-levers 18 are toggle-frames which form the immediate supports for the belt-guides and pressure devices, said tog le frames comprising two horizontal mem ers 19, pivotally mounted upon han e'rs 20, which han ersare pivotally connecte at their upper end s to the ends of the levers -18. The outer ends of the horizontal members 19 of the toggle-frames are connected by means of vertical members or links 21, as clearly shown in Fig. 4. It

will be obvious that the said 'toglgle-frame described may be thrown from t e usual position (shown in full lines in Fig. 4) to the distorted position (shown in dotted lines therein) to bringone or the other of the belt guides and pressure-devices carried by said toggleframe down upon the work. To the lower ends of the said vertical toggle members 21 are secured su porting-plates 22, said plates 7 and 8, said pressure-plates 27 being prefer ably made of thin sheet-steel of the proper width to suit the width of. belt and of such gage as to give the necessary degree of flexibihty. In order to provide a smooth yield-. ing surface for the under side of the said guide 27, it will preferably be covered with felt 29 on t e upper side of the be tand have an outer covering of paper or other ends of the pins in any suitable manner, and

I find that a good construction and one which gives a proper support for the beltwithout impairing its flexibility is that s own in the drawings, in which the end pairs and, if desired, several intermediate airs of pressure-pins 24 are provided witl f sup orting lugs or rojections 28, which en age a racket ide 27 as clearly shown in Fig. 6, the said ug'28 moving freely through the hole in the bracket 29, so as to permit flexing of the belt-guide 27 without straining the supportin connections. The means for sup lying. uid-pres-' sure to the said pressure-0y inders 23 and actuating the pressure-pins 24 com rises two fluid-pressure pipes 30, which may e mounted in convenient relation to the pressure-cylinders and in the present construction are shown as mounted on the lower horizontal members 19 of the toggle-frame (See Figs.v 1, 2, and 4.) The said pipes 30 are connected, respectively, by suitable supply-pipes 31 with two pressure-tanks 32, one of which is a highpressure tank and the other a low-pressure tank, said tanks being kept under pressure from any suitable air-compressing. device which may be driven from the driving-shaft 4 of the sander or by an independent motor, as may be desired.

Connected across the pipes 30 at suitable intervals are a series of three-Way cocks 33, from which cocks suitable connections 34 with the pressure-cylinders 23 are made. These connections 34 (see Fig. 5) are shown in the present instance as flexible tubing in order to permit movement of the supporting-plates 22 and the pressure devices carried thereby without interfering with the pressure connections when the toggle-frame is rocked to lower one or the other of the belt-guides 27. I have shown four pressure connections or v leads 34 from each three-Way cook 33, so that four pressure-pins 24, (two for each sand-belt) are controlled by each cock 33; but it will be understood that this arrangement maybe varied as may be found desirable and a greater or less number of pressure-pins 24 controlled by each cock 33. It will be seen that with this construction the pressure may be thrown from one sand-belt-to the other, as desired. 1t maybe uniformly suppliedto all ofthe pressure-pins of either one of said belts. It may be varied lengthwise of a belt by throwing the high pressure on one group of pins and the low pressure on another group, and it may be cut off altogether and the pressure-pins rendered inactive at the will of the operator, for since there is a controlling-cock for each pair of pressurepins on the respective sand-belts the pressure IIO of the successive pairs of pins may be readily varied, so that if it be desired to finish a low spot at any point in the work the 0 erator may do this by throwing on the hig pres-- sure at that particular point, leaving the rest of the pressure-pins under low pressure, if

desired.

In order that the pressuremechanism just described may be normally held in an elevated position, a counterweight is provided, said counterweight being ad'ustabl mounted on an arm 36, secured to t e sha t 17, on which the arms 18, which carry the pressure mechanism, are mounted. (See Figs. 1 and 4.)

In order that the operator may raise and lower the pressure mechanism above described relative to the work-support and work, there are provided two arms or levers 37, which are pivoted on a shaft 38, carried by the longitudinal beam 16, (see Fi 4,) the said arms 37 bein connected at t eir forward ends to the an ers 20 of the toggleframes. The said sha t 38 has its ends ex tended, as shown in dotted lines, Fig. 2, and

-' at each end of said shaft 38 is a forwardlyprojecting arm 40, from which a pull-rod 41 depends, said pull-rod 41 being threaded in a sleeve 42, carried by a bracket 43, said bracket having {En its inner side a roller 44, as

' clearly shown in Figs. 2, 3, 4, and 8. The

said sleeve 42 wheel 45, carrie by a'bracket 46, secured to the tracks 61, said sleeve and sprocket being splined together, so that the sleeve may slide freely through the sprocket and its supporting-bracket, whileat the same time rotation of the said spocket 45 will rotate the sleeve 42 and run said sleeve up or down on the pullrod, according to the direction of movement of the sprocket. The said rollers 44 project inwardly beneath vertically-movable bars 48, which are hung by means of links 49 beneath the work-table 50, the said links 49 being preferably fixed to the ends of the crossshafts 51, mounted in dependin lugs 52 on the under side of the table 50. t both ends of the table 50 one of the shafts 51 is provided with forwardly-projecting upwardlycurved arms 54, which are connected by ahandle-bar 55, extending across the front of the machine, by means of which the operator may raise and lower the said bars 48 through the link connections just described. This movement of the bars 48 when the operator; forces them downwardly against the rollers 44 will move the sleeves 42 downwardly and through the pull-rods 41 exert a downward pull on the arms 40, and in turn through the rocking shaft 38 and the arms 37 the toggleframe and pressure mechanism will be forced downwardly against the action of the counterbalancing-weight into contact with'the work.

In order that one or the other of the sandasses through a sprocket-- bolts may be brought into I operation either for dressing the work with the coarse belt or for finishing it with the fine bolt, the to gleframes are connected by means of a roc in shaft 56, preferably secured to the centra hangers 20 of the toggle-frames, so that when the said shaft 56 is rocked the toggle-frames will be thrown fromthe normal parallel positions (shown in full lines in Fig. 4) to the distorted oblique position (shown in dotted lines in Fig. 4) or to the opposite obli ue positign, as the case ma be, in order to ring one or the other of sald belt-guides or belts against the. work. It will be seen that the angular relation of To provide convenientmechanism within the reach of the operator for rocking the said shaft 56, I mount a pinion 57 on a suitablesupportabout midway of the machine, which pinion 57 meshes with a pinion 58 on the said rock-shaft 56, an operating-handle 59 being provided to rotate said pinion 57 from one position to another, said 0 crating-arm pref-- erabl resting upon a gui e-plate 60, having suita le stops at each end to limit the movements of the said handle.

The work-table 50 rests upon tracks 61, said work-table having the usual rooved supporting-rollers 62, and in order t at the sai tracks 61 and work-table 50 may be raised or lowered to accommodate different thicknesses of work the said tracks 61 are supported by means of brackets 63, carrying sprocket-wheels 64, which are threaded on and supported b screw-threaded rods or posts located wit the end posts or supports 3 of the machine-frame. -(See Figs. 2 and 3.) The said sprocket-wheels 64 are engaged by an endless sprocket-chain 65, which at the front of the machine engages a handoperated sprocket-wheel '66, having. a crank 67, by means of which the operator may rotate the same and move the chain 65, and at the rear end of the machine is preferably placed a tightening roller or sprocket68. It will be seen that by this construction the tracks 61, the work-table 50, and their associated parts may be raised or lowered as the s rocket-wheels 64 are rotated in one directlon or the other by the chain 65, andthe ad- I foo 55 my inventlon.

the work-table and pressure mechanism, the

said sprocket-chain 65 engages the sprocketwheels 45 on the sleeves 42 at each end of the machine, which are threaded to the pull-rods 41, and as the chain 65 is moved in one direction or the other rotation of the sprocketwheels 45 will actuate the sleeves 42 and raise or lower the sleeve and sprocket on the pull-rods 41, thus keepin the parts always in proper relation to eac other and giving simultaneous adjustment to them.

From the foregoing it will be seen that I have provided a sandin -machine in which the work may be roughressed by the coarse belt and then finished b the fine belt without removing it from t e work-table, that provision is made for obtaining an absolutely uniform pressure upon the sand belts throughout their length when desired, while at the same time the operator may at will vary this pressure at different points lengthwise of the work, and that either belt may be put under high or low pressure, as may be the same may be varied to a conslderable ex- I tent without de arting from the spirit of my" invention, and do not, therefore, limit myself to any of the 'details of construction shown and described except so far, as I am limited by the terms of the appended claims.

I have shown, described, and claimed a sandingbelt; but it must be understood that this term is not to be construed as limiting my invention to a machine in which a sanding-belt only is used,'for it is apparent that finishing-belts other than sanding-belts may be employed without any changein the construction or operation of this machine. Such interchanging and substitution of belts in a finishing-machine of the type shown and described is a matter governed solely by the need of the work in hand, and since it is a thing within the discretion of the workman and not dependent on machine design all such belt changes are within the purview of Having described my invention, I claim 1. In a sanding-machine, the combination with a suitable work-support, of a traveling sand-belt, a pressure device to hold the belt to the work, a source of fluid-pressure, connections between said pressure device and the source of pressure, and means for controlling said pressure connections.

2. In a sanding-machine, the combination.

with a suitable work-support, of a traveling sand-belt, a flexible belt-guide, and pressure devices operated b' fluid-pressure to hold said belt-guide and helt against the work.

3. In a sanding-machine, the combination with a suitable work-support, of a traveling sand-belt, a flexible belt-guide, and a series of fluidressure-operated pins to hold said belt-gui e and belt against the work.

4. In a sanding-machine, the combination with a suitable work-support, of a traveling sand-belt, a flexible belt-guide, and fluidpressure-operated pins b which said beltguide is supported and t c said guide and belt held against the work.

5. In a sanding-machine, the combination with a suitable work-support, of a traveling sand-belt, fluid-pressure-operated means to hold said belt against the work, a high-pressure pipe, a low-pressure pipe, and means for connecting said fluid-pressure -'operated means with either of said pipes.

6. In a sanding-machine, the combination with a suitable work-su. port, of a traveling sand-belt, a plurality o fluidressure-operated devices to force said be t against the work, a high-pressure pipe, a low-pressure pipe, and means for connecting said pressure devices with either one or both of sald pipes.

7. In a sanding-machine, the combination with a suitable work-support, of two traveling sand-belts running in fixed angular relation to the work, a pressure device for each of said belts, and means for moving either one of said belts toward or from the work without chan ing its angular relation thereto.

8. a sanding-machine, the combination with a suitable work-support, of two traveling sand-belts movable toward or from the work, and connections between said belts whereby movement of either belt will cause movement of the other in an opposite direction. 1

9. In a sanding-machine, the combination with a suitable work-support, of two traveling sand-belts, belt-guides for each of said belts, a toggle-frame supporting: said beltuides, and means for rocking'said togglei rame to throw one or the other of said guides against its belt and hold 'said belt against the work.

10. In a sanding-machine, the combination with a suitablework-support, of two traveling sand-belts, belt-guides for each of said ibelts, a pressure device for each of said beltguides, a toggle-frame supporting said belt- IIO guides and pressure devices, and means for 4 rocking 'said toggle-frame to throw one or the other of said guides and pressure devices against its belt and hold said belt against the work.

1 1. In a sanding-machine, the combination with a suitable work-support, of two traveling sand-belts, a belt-guide for each of said belts, a normally elevated supporting-frame and pressure devices against itsbelt and hold said belt against the work.

1 3. In a sanding-machine, the combination with a suitable work-sup ort, of two traveling sand-belts, abelt-guide or each of said'belts, a toggle-frame to support said guides, counterweighted supporting-arms normally holding sai frame and guides in elevated position, manually-controlled means for depressin said frame and guides, and manually-operate means for throwing said toggle-frame to an obli no position to bring one or the other of said elt-guide's and belts into operative relation to the .work.

14. In a sanding'-'ma chine,-the combination -With a suitable work-support, of a traveling sand-belt, a belt-guide, groups of fluidres- .sure pins arrangedlengthwise of the eltguide, a source of ressure, and independent controlling-cocks or each group of pressurepms.

15. In a sanding-machine,.the combination with a suitable work-support, of a traveling sand-belt, a belt-guide, groups of fluidres-v sure pins arranged lengthwise of the eltguides, a high-pressure supply, a low-pressure supply, and independent cocks for each group of pins'controlling both the high-pressure and low-pressure supply.

1 6. In a sanding-mach ne, the combination 2 with a suitable worksupport, of two traveling sand-belts, belt-guides for each of said belts, groups of fluid-pressure pins arranged lengthwise of the'beltguides, a source of fluid-pressure, and a sing e cock for one or more of the groups of pressure-pins for each belt-guide.

'17. In a sanding-machine, the combination 4 with a suitable work support and twotraveling sand-belts, pressure mechanism comprising movableframes, supporting-plates carried ,1) said frames,fiuid-pressure cyllnders on said p ates, ressu're-pins in. said cylinders, beltguides ung from said pins, and means for rocking said frames to bring one or the other of said beltuides into operative relation to its belt andt e work.

18. In a sanding-machine, the combination with a suitable work support and two travel-' sand-belts, of pressure mechanism comin prising movable frames, su porting-plates carrie by said frames, flui pressure cylinders on said plates, pressure-pms in said cylin-v ders, belt guides hung from said ins, a rock-,

anlsmto accommodate difi'erent thicknesses of work.

20. In a sanding-machine, the combination with suitable san ing instrumentalities, of a work-supp ort,su porting-posts for said worksupport, means or adjustlng said work-supportvertically on its posts, pressure mechanism to hold said sanding mstrumentalities against the work, and means for adjusting said pressure mechanism verticall simultaneously with the adjustment of t e work-support.

21. In a san'din'gmachine, the combination with a traveling sand-belt, of a work-support, supporting-brackets thereon, screwthreaded posts engaged by said brackets, s rocket-wheels carried by said brackets and t eadedon said posts, pressure mechanism to hold the belt against the work, pull-rods connected with said pressure mechanism to raise and'lower the same, brackets on the work-support through which said pullrods pass, sprocket-wheels carried by sald brackets, and a drive-chain en aging the worksupport and pressure mec anism sprocketwheels to give a simultaneous adjustment thereto.

2-2. Ina sandin -machine,thecombination with suitable sand work-table, counterbalanced pressure mechanism above said table, pull-rods connected with said pressure mechanism, and verticallymovable bars carried by said table and engaging said pull-rods to move said counterbalets and extendingbeneath said table, and vering instrumentalities, of aanced pressure mechanism into operative retically-movable bars on said table engaging I I the rollers on said pull-rod brackets to move the pressure mechanism into operative relation to the work-table and wor 24. Inasanding-machine,the combination with suitable sanding instrumentalities, of vertically-movable supporting-tracks, of a work-table mounted on said tracks, counterbalanced pressure mechanism above said table, pull-rods extending downwardly from said' pressure mechanism, brackets on said tracks throu h which said pull-rods pass, sleeves threa ed on said ull-rods and vertically movable in said rackets, s rocketwheels carried by said brackets an splined to said sleeve, brackets carried by said sleeves, rollers on said brackets, and vertieally-movable bars hung from said Work-table and engaging said rollers to move said 1 pressure mechanlsm into operative relation to the w0rk-table and Work. In testimony whereof I aflix my signature in presence of tWo Witnesses.

DE LASKI T. CLEMONS. Witnesses:

.J, PEYTREUET,

J. F. RICHARDSON. 

